Question

Exoand (3x+4) (3x-5) using identity

Answer 1

Step-by-step explanation:

$(p+a)(p+b)=x^2+(a+b)p+ab$

hear we have $p=3x$

$a=4$

$b=-5$

$(3x+4)(3x-5)$

$(3x)^2+(4-5)3x+(4)(-5)$

$9x^2+(12x-15x)-20$

$\boxed{9x^2+-3x-20}$